Good point. Someone once told me that our trees were not like ivy. They don't do grow and grow and grow. On trees, branches get trimmed, and fall off and die all the time. Sometimes they even get cut down completey.
About the situation, I came from a small school. After I graduated most of the greek life went local with the exception of about 5. Off campus greeks hazed more because no one was watching them. The people that pledged them I guess didn't "get" that you didn't have to be hazed for people to like you.

I think the girls saw going local as a chance to get HQ and their CCD of their backs. There is no alumnae support in the small college town, so they were never really used to having advisors or good examples. Oh well.